Ascii85
Sign in to saveAlso known as base 85, base85, Pentoctogesimal, base85 encoding
Ascii85, also called Base85, is a binary-to-text encoding developed by Paul E. Rutter for the btoa utility. By using five ASCII characters to represent four bytes of binary data (making the encoded size larger than the original, assuming eight bits per ASCII character), it is more efficient than uuencode or Base64, which use four characters to represent three bytes of data ( increase, assuming eight bits per ASCII character).
In the Vinony graph
Vinony's link graph records 48 inbound references to Ascii85, and connects out to Q186055, Uuencoding and human-readable medium.
It is catalogued under topics including Binary-to-text encoding formats and Positional numeral systems.
Vinony links it to 8 Wikipedia language editions.
~13 min read
Encyclopedic overview
14 sectionsContents
- Overview
- Encoding
- Limitations
- History
- btoa version
- ZMODEM version
- Adobe version
- Example for Ascii85
- Compatibility
- <nowiki>RFC 1924</nowiki> version
- See also
- Notes
- References
- External links
Ascii85, also called Base85, is a binary-to-text encoding developed by Paul E. Rutter for the btoa utility. By using five ASCII characters to represent four bytes of binary data (making the encoded size larger than the original, assuming eight bits per ASCII character), it is more efficient than uuencode or Base64, which use four characters to represent three bytes of data ( increase, assuming eight bits per ASCII character).
Its main modern uses are in Adobe's PostScript and Portable Document Format file formats, as well as in the patch encoding for binary files used by Git.
Excerpted from Wikipedia’s “Ascii85” article, available under the CC BY-SA 4.0 licence.